CN1083943C - Electronic cam compensation of pressure change of servo controlled pumps - Google Patents

Electronic cam compensation of pressure change of servo controlled pumps Download PDF

Info

Publication number
CN1083943C
CN1083943C CN97113710A CN97113710A CN1083943C CN 1083943 C CN1083943 C CN 1083943C CN 97113710 A CN97113710 A CN 97113710A CN 97113710 A CN97113710 A CN 97113710A CN 1083943 C CN1083943 C CN 1083943C
Authority
CN
China
Prior art keywords
pump
pressure
motor
compensation
pressure curve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN97113710A
Other languages
Chinese (zh)
Other versions
CN1175664A (en
Inventor
E·J·谢弗
N·A·沃纳
J·J·汉迪兹尔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Graco Inc
Original Assignee
Graco Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Graco Inc filed Critical Graco Inc
Publication of CN1175664A publication Critical patent/CN1175664A/en
Application granted granted Critical
Publication of CN1083943C publication Critical patent/CN1083943C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0041—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation by piston speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • F04B11/0058—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0201—Position of the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0213—Pulses per unit of time (pulse motor)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The construction and operation of the control of this invention is designed to minimize pressure changes at pump changeover by sampling pump pressure characteristics for each pump cycle, calculating a compensating motion profile and applying the profile to the motor which drives the pump. This control can be used with any pump which has the following characteristics: positive displacement, repeating cycle characteristics, rotary motor drive and an output pressure cycle curve which never falls to zero.

Description

The electronic stencil compensation that the servocontrol pumping pressure changes
The application is the part continuity of the U. S. application sequence number 60/018,552 of proposition on May 29th, 1996.
The present invention relates to the electronic stencil compensation of servocontrol pumping pressure warp.
Various types of pumps are used to carry and circulating liquid for many years.In many cases, desirable pump type is a kind of reciprocating pump, but one of them unfavorable aspect of this class reciprocating pump is, the output of this pump is easy to produce fluctuation, result or need compensation, or tolerate the existence of this fluctuation.A kind of reduce to fluctuate repay examination.See U. S. Patent 5,145,339, its content as a reference.Though generally speaking than the advanced design of other prior art, some fluctuations still exist this structure.
An object of the present invention is to provide a kind of reciprocating pump, the advantage of the reciprocating pump of not fluctuation, and maintenance basically.
According to an aspect of the present invention, a kind of multi cylinderpump is driven by a revolution motor, it is characterized in that this multi cylinderpump comprises:
To the device of each pump circuit pressure diagram sampling,
By described sampling apparatus calculate a compensatory pressure curve device and
Use the device that described compensatory pressure curve is controlled described motor.
According to other aspect of the present invention, a kind of method of control one multi cylinderpump, this multicylinder pump is driven by revolution motor, it is characterized in that, and this method comprises the following steps:
To each pump circuit pressure diagram sampling;
Calculate a compensatory pressure curve by described sampling apparatus; And
By using the described motor of described compensatory pressure curve controlled.
Other pump comprises that also there are some fluctuations at least in gear pump and cam pump.The present invention can be applicable to all these class pumps, to reduce fluctuation.
The operation of structure of the present invention and control is used for reducing variation in pressure when pump commutates, by in each pump circulation the pumping pressure characteristic being sampled, calculate a compensating motion template, and this template is applied to the motor of driven pump.In fact, this control can be used for appointing watches the pump that possesses following properties, positive displacement, and the reciprocation cycle characteristics, revolution motor drives and a delivery pressure cyclic curve never reduces to zero.
This control system can reduce the pressure surge in the pump commutation like this.It can also change the motion template with adapting to and compensates some change of state in addition, rate variation for example, changes in material (viscosity, etc.).It can also diagnose the operation of pump, fatigue and fault.
Mechanical means has been used in the examination of repaying of manufacturing ripple disable rear pump in the past, for example above-mentioned U. S. Patent 5,145,399.Compensatory pressure changes the examination of repaying done, and is that keep stabilizing torque load, these methods by electronically closing speed loop or on motor be to have counteractively, the trend of overcompensation is arranged, and because the inertia greatly of system has the trend of overcompensation and delay.When variation in pressure had comparatively faster fluctuation, particularly when pump reached high flow and high flow velocities, this situation was obvious especially, for reducing overcompensation, can reduce gain coefficient, but will be weakened and can not disappear thereupon fluctuation.
This solution, promptly continuous delivery pressure curve to pump is sampled and is calculated a correct compensating motion template, its objective is these two problems of solution.But change and diagnose the fatigue and the fault of disconnected pump by control continuous sampling compensating coefficient.By revising the motion template of pump simultaneously, can eliminate the overcompensation of pressure output with variation in pressure.Also have, but by adjusting the also mechanical hysteresis in the bucking-out system of this motion template of phase place.
These and other objects of the present invention and advantage can be from following descriptions, and in conjunction with the accompanying drawings, more fully embodied.Reference mark identical in the accompanying drawing is represented same or analogous parts in all a few width of cloth figure.
Fig. 1 is the control sketch of a pump of the present invention.
Fig. 2 is the plotted curve of a real response and the compensation response that calculates.
Fig. 3 is the plotted curve of a single compensation template.
Figure 1 shows that a system 10, comprise a low pulse double-piston pump 12, drive by a servomotor 14.Certainly, other pump or motor also can be used.The absolute position of pump 12 can be definite like this, and by the position that a proximity detector 16 is followed the tracks of each pump circuit pump, an encoder is determined the absolute position of the servomotor that is coupled to this pump then.
The instantaneous pressure of one pressure transducer, 18 monitoring pumps, 12 outputs.The pressure output relevant of one computer, 20 record pumps 12 with its absolute position.By analyzing one or more circuit pressure diagrams of pump, can determine a pressure diagram, as Fig. 2 about the position.Like this, can calculate compensation template (also seeing Fig. 2), be applied to motor and produce ripple disable output.
But this compensation analysis repeated application is in the continuous adjustment of system.By monitoring pressure continuously, any state that exceeds the pump characteristics normal range (NR) all can identify, but a suitable emergency alarm misdirection.In addition, ever-increasing compensation can be used as the sign of pump fatigue, and in a proper time, alarm promptly can be sounded.
Importantly single phase place is a characteristic of pump in advance.By observing operating lag for the output of the pressure crest input determined of being easy to be in operation, can determine this characteristic, for example output can lag behind one and import the X degree of motor/pump rotation.
In view of this, an independent compensation template can be applicable to most of pressure and descends, and its amplitude and length are by the pressure fall, and area and length determine that this will significantly reduce template in the required amount of calculation of real-Time Compensation.Fig. 3 can be corresponding to such compensation template.
It should be understood that this control system also can make various variations and modification, and do not break away from following determined the spirit and scope of the invention.

Claims (4)

1, a kind of multi cylinderpump is driven by a revolution motor, it is characterized in that this multi cylinderpump comprises:
To the device of each pump circuit pressure diagram sampling,
By described sampling apparatus calculate a compensatory pressure curve device and
Use the device that described compensatory pressure curve is controlled described motor.
2, multicylinder pump according to claim 1 is characterized in that further comprising the phase lag of compute control input and the device of the described hysteresis of compensation.
3, require 1 described multicylinder pump according to claim, it is characterized in that further comprising the device of the rotational position of determining described motor.
4, a kind of method of control one multi cylinderpump, this multicylinder pump is driven by revolution motor, it is characterized in that, and this method comprises the following steps:
To each pump circuit pressure diagram sampling;
Calculate a compensatory pressure curve by described sampling apparatus; And
By using the described motor of described compensatory pressure curve controlled.
CN97113710A 1996-05-29 1997-05-28 Electronic cam compensation of pressure change of servo controlled pumps Expired - Lifetime CN1083943C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US863,115 1977-12-22
US1855296P 1996-05-29 1996-05-29
US018,552 1996-05-29
US018552 1996-05-29
US08/863,115 US5971714A (en) 1996-05-29 1997-05-27 Electronic CAM compensation of pressure change of servo controlled pumps
US863115 1997-05-27

Publications (2)

Publication Number Publication Date
CN1175664A CN1175664A (en) 1998-03-11
CN1083943C true CN1083943C (en) 2002-05-01

Family

ID=26691243

Family Applications (1)

Application Number Title Priority Date Filing Date
CN97113710A Expired - Lifetime CN1083943C (en) 1996-05-29 1997-05-28 Electronic cam compensation of pressure change of servo controlled pumps

Country Status (7)

Country Link
US (1) US5971714A (en)
EP (1) EP0810370B1 (en)
JP (1) JPH112187A (en)
KR (1) KR100475317B1 (en)
CN (1) CN1083943C (en)
DE (1) DE69729772T2 (en)
TW (1) TW365630B (en)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6158967A (en) * 1998-08-26 2000-12-12 Texas Pressure Systems, Inc. Barrier fluid seal, reciprocating pump and operating method
US7270137B2 (en) 2003-04-28 2007-09-18 Tokyo Electron Limited Apparatus and method of securing a workpiece during high-pressure processing
US7163380B2 (en) * 2003-07-29 2007-01-16 Tokyo Electron Limited Control of fluid flow in the processing of an object with a fluid
US7767145B2 (en) * 2005-03-28 2010-08-03 Toyko Electron Limited High pressure fourier transform infrared cell
RU2557605C2 (en) * 2005-05-02 2015-07-27 Элопак Системс Аг Device and method of filling of partially formed containers
GB0605136D0 (en) * 2005-05-02 2006-04-26 Elopak Systems Apparatus and method
US7740152B2 (en) * 2006-03-06 2010-06-22 The Coca-Cola Company Pump system with calibration curve
US11906988B2 (en) 2006-03-06 2024-02-20 Deka Products Limited Partnership Product dispensing system
US11214476B2 (en) 2006-03-06 2022-01-04 Deka Products Limited Partnership System and method for generating a drive signal
US9146564B2 (en) 2006-03-06 2015-09-29 Deka Products Limited Partnership Product dispensing system
US10631558B2 (en) 2006-03-06 2020-04-28 The Coca-Cola Company Methods and apparatuses for making compositions comprising an acid and an acid degradable component and/or compositions comprising a plurality of selectable components
CN101737379B (en) * 2008-11-21 2012-08-29 鸿富锦精密工业（深圳）有限公司 Speed-pressure control device of oil pressure type equipment
SE533726C2 (en) 2009-04-30 2010-12-14 Moelnlycke Health Care Ab Apparatus with negative pressure for treatment of wounds
US20100322806A1 (en) * 2009-06-18 2010-12-23 Aregger Markus Arrangement including a gear pump
EP2275683B1 (en) * 2009-06-18 2017-01-11 Maag Pump Systems AG Method for controlling a gear pump
CN102573948B (en) * 2009-09-22 2014-10-01 莫恩里克保健公司 An apparatus and method for controlling the negative pressure in a wound
JP5735532B2 (en) * 2009-12-08 2015-06-17 グラコ ミネソタ インコーポレーテッド Control device and method for linear pump device
GB2481624A (en) * 2010-07-01 2012-01-04 Agilent Technologies Inc Controller and piezoelectric actuator provides pressure ripple compensation in chromatographic pump drive
EP2606000B1 (en) 2010-08-20 2016-10-05 Graco Minnesota Inc. Method for synchronizing linear pump system
US9222575B2 (en) * 2010-12-22 2015-12-29 Gm Global Technology Operations, Llc Electric pump
CN102615550B (en) * 2011-01-28 2015-07-08 上海英威腾工业技术有限公司 Alternating current servo control device adopting electronic gear and use method thereof
DE102011121837B4 (en) 2011-12-21 2019-07-04 Robert Bosch Gmbh Method for operating variable-speed pumps and variable-speed pump
AT512322B1 (en) * 2011-12-30 2013-09-15 Bhdt Gmbh HYDRAULIC DRIVE FOR A PRESSURE TRANSLATOR
CN104251201B (en) 2013-06-28 2016-12-28 伊顿公司 The control system of pump based on converter and method and pumping system
CN104251245B (en) * 2013-06-28 2016-12-28 伊顿公司 Servopump controls system and method
CN104251202B (en) * 2013-06-28 2017-03-01 伊顿公司 Offset the control system of fluctuation method for implanting and device and pump
DE102013216342B4 (en) 2013-08-19 2022-07-28 Robert Bosch Gmbh Damping of harmonic pressure pulsations of a hydraulic pump by varying the speed
CA2941532C (en) * 2014-03-31 2023-01-10 Schlumberger Canada Limited Reducing fluid pressure spikes in a pumping system
WO2016122978A1 (en) 2015-01-26 2016-08-04 Schlumberger Canada Limited Method for minimizing vibration in a multi-pump system
DE102015201961A1 (en) * 2015-02-04 2016-08-04 Volkswagen Aktiengesellschaft Method for operating a positive displacement pump and a dedicated positive displacement pump
US9517803B2 (en) * 2015-04-14 2016-12-13 GM Global Technology Operations LLC Vehicle having rear spoiler with active vertical side plates, and method of controlling the same
DE102016106483B4 (en) 2016-04-08 2019-02-07 Jenaer Antriebstechnik Gmbh Method for compensation of cyclical disturbances during operation of a pump and control unit
EP3904681A3 (en) 2016-04-19 2021-12-22 ClearMotion, Inc. Active hydraulic ripple cancelation methods and systems
CN108171145B (en) * 2017-12-26 2020-08-28 迈克医疗电子有限公司 Flow control method and apparatus, analyzer, and computer-readable storage medium
CN109578258B (en) * 2018-10-12 2020-10-30 迈克医疗电子有限公司 Liquid phase control method and device, high-pressure constant flow pump and storage medium
WO2021209087A1 (en) * 2020-04-16 2021-10-21 Schaeffler Technologies AG & Co. KG Pump actuator and method for controlling a pump actuator
DE102021211175A1 (en) 2021-10-04 2023-04-06 Vitesco Technologies GmbH Method for operating an electric motor, feed pump, motor vehicle with such a feed pump, computer program and computer-readable medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4950235A (en) * 1988-05-10 1990-08-21 Pacesetter Infusion, Ltd. Container-side occlusion detection system for a medication infusion system
US5457626A (en) * 1994-09-01 1995-10-10 Dionex Corporation Bimodal liquid chromatography pump employing artificial intelligence logic feedback control

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137011A (en) * 1977-06-14 1979-01-30 Spectra-Physics, Inc. Flow control system for liquid chromatographs
JPS5770975A (en) * 1980-10-18 1982-05-01 Nikkiso Co Ltd Non-pulsation metering pump
US4801247A (en) * 1985-09-02 1989-01-31 Yuken Kogyo Kabushiki Kaisha Variable displacement piston pump
JP2623526B2 (en) * 1985-12-10 1997-06-25 ダイキン工業株式会社 Compressor drive method
JP2604362B2 (en) * 1986-10-22 1997-04-30 株式会社日立製作所 Low pulsation pump
JP2745526B2 (en) * 1988-03-28 1998-04-28 株式会社島津製作所 Reciprocating liquid pump
SE9600748D0 (en) * 1996-02-27 1996-02-27 Pharmacia Biotech Ab Pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4950235A (en) * 1988-05-10 1990-08-21 Pacesetter Infusion, Ltd. Container-side occlusion detection system for a medication infusion system
US5457626A (en) * 1994-09-01 1995-10-10 Dionex Corporation Bimodal liquid chromatography pump employing artificial intelligence logic feedback control

Also Published As

Publication number Publication date
TW365630B (en) 1999-08-01
JPH112187A (en) 1999-01-06
EP0810370A3 (en) 1999-06-02
KR100475317B1 (en) 2005-06-02
DE69729772T2 (en) 2004-11-04
EP0810370B1 (en) 2004-07-07
DE69729772D1 (en) 2004-08-12
EP0810370A2 (en) 1997-12-03
US5971714A (en) 1999-10-26
CN1175664A (en) 1998-03-11
KR970075367A (en) 1997-12-10

Similar Documents

Publication Publication Date Title
CN1083943C (en) Electronic cam compensation of pressure change of servo controlled pumps
DE112011101269B4 (en) Phase shift control for an oscillating pump system
US5259731A (en) Multiple reciprocating pump system
DE102007016655B4 (en) Drive controller for linear compressor and method therefor
DE69738369T2 (en) METHOD AND DEVICES FOR FIXING THE PUMP IN SPILL COMPRESSORS
EP0626628B1 (en) Control system for a hydraulic drive
EP0230009A2 (en) Regulation method for turbocompressors in order to avoid surge
US6227807B1 (en) Constant flow fluid pump
DE112018003927B4 (en) Method for regulating the output pressure of a hydraulic drive system, use of the method and hydraulic drive system
EP2145112B1 (en) Device and method for fault monitoring
DE69620597T2 (en) DEVICE FOR DETERMINING CONTROL CONSTANTS
EP3591226B1 (en) Metering pump and method for controlling a metering pump
JPH10501042A (en) Bimodal liquid chromatography using artificial intelligence logic feedback control
EP2696175A1 (en) Method for detecting the flow rate of a centrifugal pump
DE602004005418T2 (en) LINEAR COMPRESSOR CONTROL SYSTEM, METHOD FOR CONTROLLING A LINEAR COMPRESSOR, LINEAR COMPRESSOR AND COOLING SYSTEM
EP0905596A2 (en) Automatic adaption of the control range of a pressure control loop in multiple pump arrangements
CN1157359A (en) Method for controlling RPM of engine in hydraulic construction machine
EP0593523B1 (en) Process for operating a speed controlled motor
EP2881584B1 (en) Sensorless disturbance detection in metering pumps with stepping motor
DE19842565A1 (en) Pump arrangement for pressure regulation with PID regulator, having microprocessor system which calculates conduct of regulation path, and determines and sets derived parameters of regulator
DE69026273T2 (en) FLOWMETER
CN1898479A (en) Learning method for oncoming clutch fill level and volume
DE10196533B4 (en) Device for controlling reciprocating compressor used for compressing gas in refrigerator has current phase detecting section outputting square wave corresponding to detected current supplied to compressor
EP3228865B1 (en) Method for compensating for cyclic disturbances during the operation of a pump and control unit
JP2723912B2 (en) Control device for pulseless pump

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CX01 Expiry of patent term
CX01 Expiry of patent term

Granted publication date: 20020501